Improvement in shuttles for sewing-machines



G. H. THOMAS.

SHUTTLE FOR SEWING-MACHINES.

No. 191,268. Patented May 249,11877'.

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GEORGE H. THOMAS, OF BOWMANVILLE, ONTARIO, CANADA, ASSIGNOR OF ONE-HALFHIS RIGHT TO WILLIAM JAMES MCMURTBY AND CHARLES TOD, OF SAME PLACE.

IMPROVEMENT IN SHUTTLESHFOR SEWING-MACHINES.

Specification forming part of Letters Patent No. 191,268, dated May 29,1877; application filed February 19, 1877.

To all whom it may concern:

Be it known that I, GEORGE HIBBERT THOMAS, of the town of Bowmanville,in the county of Durham, iu the Province of Ontario, Canada, machinist,have invented new and useful Improvements in Sewing-Machine Shuttles,which improvements are fully set forth in the following specification,reference being had to the accompanying drawings.

The invention consists in a simple, cheap, and light-running shuttle, inwhich the tension is easily regulated, and the parts are readilyaccessible.

It consists in making a skeleton shuttle, preferably stamped from sheetmetal, and in which the tension is secured by passing the thread betweena tapered spring-plate riveted to the inner side of the face or hingedplate of the shuttle.

Figure 1 is a perspective view, with plate A open. Fig. 2 is a sideelevation. Fig. 3 is a bottom plan. Fig. 4 is an end'view.

A is the bobbin-holder, to which is hinged the slotted plate B. Thepivots b b of the bobbin C t into holes drilled in the holder A. Oneside of the hole into which the pivot b fits is cutaway, so that thebobbin C may be readily inserted or withdrawn when the hinged plate B isthrown open, as shown in Fig. 1. When this plate is closed, as shown inFig. 2,

the cap D forms the side cut away, and-thusY the bobbin C is held inposition. When closed, the pieces A and B snap-fasten at I.

E is a tapered spring-plate, riveted at one end to B, as shown. Thisplate has a notched edge. Into one of these notches the thread isinserted when passed under thesaid plate E, the thread being movednearer to the rivet in proportion to the strength of the tensiondesired. The guard -wire F prevents the thread from jumping out of thenotch into which it may have been placed.

G is a guard-plate, shaped and attached to the bobbin-holder A, asshown. On the inner side of this guard-plate I rivet the threadspring H,which is thus protected while it accomplishes the duty it is designed toperform.

This thread-spring and guard-plate need only be attached to the shuttlewhen it is to be used in a machine requiring a thread-spring.

Shuttles as at present constructed are generally manufactured fromblocks of malleable cast-iron, which have to be hollowed out bymachinery, to receive the bobbin. The process is, of course, expensive,and the shuttle produced is weighty, generating friction and noise inrunning.

The advantages of a skeleton shuttle constructed as described are thatit is cheaply and easily constructed, being stamped from sheet metal,preferably steel, and tempered to resist Wear. Itis'a light-runningshuttle, and all its parts are readily accessible.

I am aware that a skeletonshuttle could be' connected togetherdiiferently. I therefore do not limit my claim to the exact constructionshown.

I do not claim anything peculiar in the material used, or in thedimensions of the respective parts, as in these respects my shuttle maybe the same as other shuttles now known; nor is it necessary that Ishould explain the manner of threading the shuttle, as any operatorexamining the shuttle will understand how to proceed 5 but What I doclaim as my invention isl. The bow-shaped reel-holder A, in combi nationwith the slotted plateI B, hinged together and forming askeleton-shaped'shuttle, substantially as and for the purpose specified.

2. The cap D, attached to the slotted plate B, in combination with thepivot b' and reelholder A, arranged substantially as and for the purposespecified.

3. The combination, substantially as described, of theA plate B, springnotched plate E, and Wire F, as and for the purpose set forth.

4. The combination of the plate A, guardplate G, and thread-spring H,substantially as shown and described.

GEO. H. THOMAS.

Witnesses:

W. H. J oNEss, R. RUSSELL LoscoMBE.

